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Photo#145833
Toxomerus marginatus? - Toxomerus marginatus - female

Toxomerus marginatus? - Toxomerus marginatus - Female
At ~3860' on Sawmill Creek, Clear Creek Management Area (BLM), San Benito County, California, USA
September 9, 2007
I think this is Toxomerus marginatus from searching through BugGuide photos/comments (and a "semi-reinforcing" experience working through the key to Syrphidae in Cole(1)).

If it is, I 'm guessing it's a female from the black stripe on the frons (compare with the gravid member of this pair ). Please let me know if you think I've erred!

It was photographed on an uncommon Goldenrod species Solidago guiradonis along a creek in the unusual "chaparral/conifer woodland" habitat of the large, arid, serpentine area of Clear Creek near San Benito Mountain.

Images of this individual: tag all
Toxomerus marginatus? - Toxomerus marginatus - female Toxomerus marginatus? - Toxomerus marginatus - female

Two individuals?
These two photos seem to be of different individuals, I think one is likely male and one female.

You've nailed the ID.
Have you seen the visual key that Martin developed?

Bottom line: On the west coast, you'll encounter three Toxomerus spp.
1. T. marginatus
2. T. politus
3. T. orientalis (elsewhere T. geminatus)

 
Thanks Ron
Yes, I saw Martin's key after seeing a comment elsewhere...it's very nice! (And helpful:-)

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